ABSTRACT
Moisture content is a fundamental
physical index that quantifies soil property and is closely associated with the
hydrological, ecological and engineering behaviours of soil. To measure in-situ
soil moisture contents, a distributed measurement system for in-situ soil
moisture content is introduced. The system is based on carbon-fiber heated
cable technology that has been developed to enhance the measuring accuracy of
in-situ soil moisture content. Using carbon-fiber heated cable technique, a
temperature characteristic value (Tt) can be defined from temperature- time
curves. A relationship among Tt, soil thermal impedance coefficient and soil
moisture content is then established in laboratory. The feasibility of the
SM-DTS technology to provide distributed measurements of in-situ soil moisture
content is verified through field tests. The research reported indicates that
the proposed SM-DTS is capable of measuring in-situ soil moisture content over
long distances and large area.
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